Question

Match List - I with List - II.

List - I (Bio-herbicide)	List - II (Target Weed)
A. Devine B. Collego C. Velgo D. Dr. Biosedge	I. Morrenia odorata II. Cyperus esculentus III. Aeschynomene virginia IV. Abutilon theophrastus

• A. А-ІІІ, В-II, C-IV, D-I
• B. А-ІІІ, В-II, C-I, D-IV
• C. A-I, B-IV, C-III, D-II
• D. A-I, B-III, C-IV, D-II

Hint:

Devine was the very first bio-herbicide (1981). The name Dr. Biosedge is a giveaway—always look for *Cyperus* species when you see "sedge" in a weed control context.

Answer 1

The Correct Option is D

Concept: Bio-herbicides are biological control agents (mostly fungi, known as mycoherbicides) applied in a similar way to chemical herbicides to control specific weed populations. Each commercial bio-herbicide is host-specific.

Step 1: Identify the first commercial bio-herbicides (A and B).
1. Devine (A): This was the first commercial mycoherbicide, consisting of *Phytophthora palmivora*. It targets the strangler vine, Morrenia odorata (I), in citrus groves.
2. Collego (B): Consists of *Colletotrichum gloeosporioides* and is used to control Northern Jointvetch, Aeschynomene virginia (III), in rice and soybean.

Step 2: Match the newer bio-herbicides (C and D).
1. Velgo (C): This is directed against velvetleaf, Abutilon theophrastus (IV).
2. Dr. Biosedge (D): As the name "sedge" implies, it targets sedges like Cyperus esculentus (II) (Yellow Nutsedge).

Step 3: Final Alignment.
The correct pairing is A-I, B-III, C-IV, D-II, corresponding to Option (4).